JP2007271664A - Lens barrel, interchangeable lens, camera - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compact lens barrel, an interchangeable lens and a camera. <P>SOLUTION: A gyro sensor 10X is provided on a substrate 1, a gyro sensor 10Y is provided on a substrate 2. Besides, the substrate 1 includes a circuit for processing the signal of the gyro sensor 10X. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a lens barrel provided with a shake detection sensor, an interchangeable lens, and a camera.

A lens barrel provided with a shake detection sensor is disclosed in Patent Document 1.
In the lens barrel described in Patent Document 1, two shake detection sensors are mounted on a hard substrate formed in an arc shape, and a signal of the shake detection sensor is transmitted to a lens CPU provided outside the substrate. It is configured.
However, it has been difficult to reduce the size of a lens barrel provided with a conventional shake detection sensor.
JP 2004-146659 A

  An object of the present invention is to provide a small lens barrel, an interchangeable lens, and a camera.

The present invention solves the above problems by the following means. In addition, in order to make an understanding easy, although the code | symbol corresponding to the Example of this invention is attached | subjected and demonstrated, it is not limited to this.
According to the first aspect of the present invention, a first shake sensor (10X) that detects a shake in a first direction and a second shake sensor (10Y) that detects a shake in a second direction different from the first direction. ), The first shake sensor is disposed on the first hard substrate (1), and the second shake sensor is disposed on a second hard substrate (2) different from the first hard substrate. And a processing circuit (20) for processing a signal of at least one of the first shake sensor and the second shake sensor on at least one of the first hard board and the second hard board. The lens barrel (200) is characterized by being arranged.
According to a second aspect of the present invention, in the lens barrel according to the first aspect, at least one of the first hard substrate (1) and the second hard substrate (2) includes the first shake sensor. The lens barrel (200) is characterized in that a processing circuit (20) for processing both signals (10X) and the second shake sensor (10Y) is arranged.
According to a third aspect of the present invention, in the lens barrel according to the first or second aspect, the substrate surface of the first hard substrate (1) and the second hard substrate (2) are orthogonal to each other. A lens barrel (200) characterized in that
According to a fourth aspect of the present invention, in the lens barrel according to the third aspect, the first hard substrate (1) and the second hard substrate (2) are around the optical axis of the lens of the lens barrel. A lens barrel (200) characterized in that
According to a fifth aspect of the present invention, in the lens barrel according to the third or fourth aspect, at least one of the first shake sensor (10X) and the second shake sensor (10Y) detects a shake. The lens barrel (200) is characterized in that the direction of the detection axis is perpendicular to the substrate surface to which the detection axis is attached.
The invention of claim 6 is an interchangeable lens (200) comprising the lens barrel according to any one of claims 1 to 5.
A seventh aspect of the invention is a camera (100) including the lens barrel (200) according to any one of the first to fifth aspects.
In addition, you may improve suitably the structure which attached | subjected the code | symbol. In addition, at least a part may be replaced with another component, and the configuration requirements that are not particularly limited with respect to the configuration are not limited to the configurations disclosed in the embodiments.

  According to the present invention, a small lens barrel, an interchangeable lens, and a camera can be provided.

  Hereinafter, the present invention will be described in more detail with reference to the drawings and the like.

FIG. 1 is a schematic diagram showing an outline of a camera equipped with the interchangeable lens of this embodiment.
The camera of this embodiment is used with the interchangeable lens 200 attached to the camera body 100. The interchangeable lens 200 includes a photographing optical system (not shown). A part of the lens group constituting the photographing optical system is movable in a direction substantially orthogonal to the optical axis, and is a blur correction lens group that corrects image blur by this movement. Also, in the interchangeable lens 200, an AF driving unit 60 (which will be described later) communicates with the camera body 100 and moves the focus lens group in the photographing optical system in the optical axis direction in accordance with an instruction from the camera body 100. 3).

Further, the interchangeable lens 200 has a substrate 1, a substrate 2, and a substrate 3.
The board | substrate 1 and the board | substrate 2 are the hard boards by which the circuit wiring was comprised in the multilayer, and the board | substrate surface is a substantially rectangular shape.
The substrate 1 is arranged so that the substrate surface is vertical when the interchangeable lens 200 is attached to the camera body 100 and the posture of the camera body 100 is set to the normal position (usually the direction in which the shooting screen is horizontally long). Has been.
The substrate 2 is arranged so that the substrate surface is horizontal when the camera body 100 is in the normal position.
Therefore, the substrate surfaces of the substrate 1 and the substrate 2 are orthogonal to each other.
The substrate 3 is formed of a flexible printed wiring board having flexibility.
The electric circuit of the substrate 1 and the electric circuit of the substrate 2 are connected by the electric circuit of the substrate 3 and are arranged around the photographing optical system.

FIG. 2 is an expanded view of the substrate 1, the substrate 2, and the substrate 3.
FIG. 3 is a block diagram showing the contents of the circuits provided on the substrate 1, the substrate 2, and the substrate 3.
Connected to the substrate 1 are a VCM (voice coil motor) 30, a lens position detection sensor 40, and an AF driving unit 60.
The VCM 30 is an actuator that drives the vibration reduction lens group.
The lens position detection sensor 40 is a sensor that detects the position of the vibration reduction lens group.
The VCM 30 and the lens position detection sensor 40 are provided in each of two directions of the X direction and the Y direction that are orthogonal to each other. However, in the following description, for the sake of simplicity, only one is described.
The AF driving unit 60 includes a motor such as an ultrasonic motor that drives the focus lens group and an encoder that detects the position of the focus lens group, and drives the focus lens group according to an instruction from the AF circuit 50.

The substrate 1 is provided with a gyro sensor 10X, a lens CPU 20, an AF circuit 50, and a communication circuit 70. On the other hand, the substrate 2 is provided with a gyro sensor 10Y and a power supply circuit 90. The gyro sensor 10X, the gyro sensor 10Y, the lens CPU 20, the AF circuit 50, the communication circuit 70, and the power supply circuit 90 are each integrated as one chip, and each chip is mounted on the substrates 1 and 2. Yes.
The gyro sensor 10 </ b> X is mounted on the substrate 1 and detects an angular velocity around the detection axis in a direction perpendicular to the substrate surface of the substrate 1. Accordingly, it is possible to detect the pitching (see FIG. 1) shake of the interchangeable lens 200 by the gyro sensor 10X. The shake signal detected by the gyro sensor 10X is sent to the lens CPU 20.
The gyro sensor 10Y is mounted on the substrate 2 and detects an angular velocity around the detection axis in a direction perpendicular to the substrate surface of the substrate 2. Accordingly, yaw (see FIG. 1) shake of the interchangeable lens 200 can be detected by the gyro sensor 10Y. The shake signal detected by the gyro sensor 10Y is sent to the lens CPU 20 via the substrate 3.

The lens CPU 20 is an arithmetic circuit that controls the operation of the interchangeable lens 200, and includes amplifiers 21X, 21Y, 23, filters 22X, 22Y, 24, an AD converter 25, a shake amount calculation block 26, a lens position calculation block 27, and a control amount calculation. A block 28 and a motor driver 29 are provided.
The amplifiers 21X, 21Y, and 23 amplify signals obtained from the gyro sensor 10X, the gyro sensor 10Y, and the lens position detection sensor 40, respectively, and transmit them to the filters 22X, 22Y, and 24.
The filters 22X, 22Y, and 24 are circuits that remove noise components from the signals sent from the amplifiers 21X, 21Y, and 23, respectively.
In FIG. 3, only one system of the amplifier 23 and the filter 24 is shown, but actually, one is provided in each of the X direction and the Y direction, and the lens position provided in each of the X direction and the Y direction. The signal from the detection sensor 40 is processed separately.

The AD converter 25 is a part that converts an analog signal obtained from each sensor into a digital signal.
Based on the signals obtained from the gyro sensors 10X and 10Y, the blur amount calculation block 26 calculates the amount of image blur on an imaging surface (not shown) due to the shake of the interchangeable lens 200.
The lens position calculation block 27 calculates the position of the blur correction lens group based on the signal obtained from the lens position detection sensor 40.
The control amount calculation block 28 is based on the information obtained from the blur amount calculation block 26 and the lens position calculation block 27, and the movement amount, movement speed, etc. of the blur correction lens group necessary for reducing image blur on the imaging surface. A control amount necessary for driving control of the blur correction lens group is calculated and transmitted to the motor driver 29.
The motor driver 29 drives the VCM 30 according to the control amount obtained from the control amount calculation block 28.

The AF circuit 50 is a circuit that obtains position information of the focus lens group from the AF drive unit 60 and obtains an instruction from the camera CPU 80 and instructs the AF drive unit 60 to drive the focus lens group.
The communication circuit 70 is a circuit that communicates with the camera CPU 80 through a mount contact (not shown). Note that the communication circuit 70 and the mount contact are connected by a flexible substrate or the like.
The power supply circuit 90 includes a DCDC converter and the like, and is a part that adjusts the power used in the interchangeable lens 200, and is controlled by the camera CPU 80.

As described above, all the circuits necessary for the interchangeable lens 200 of this embodiment are provided on the substrate 1 and the substrate 2. Therefore, there is no need to provide a dedicated substrate for mounting the gyro sensor 10X and the gyro sensor 10Y as in the conventional case, and a smaller interchangeable lens can be obtained.
In addition, the substrate 1 and the substrate 2 of this embodiment have a substantially rectangular shape on the substrate surface. Therefore, compared to the conventional arc-shaped sensor-dedicated substrate, the substrate 1 and the substrate 2 can be applied in a multifaceted manner. ) And manufacturing efficiency can be increased.

  Further, the gyro sensor 10X of the present embodiment is mounted on the same substrate 1 as the lens CPU 20 having the AD converter 25, and the gyro sensor 10Y is mounted on the substrate 2 disposed near the substrate 1. ing. Therefore, the distance from the gyro sensor 10X and the gyro sensor 10Y to the AD converter 25 is short, and mixing of noise due to the analog signal being transmitted over a long distance can be prevented.

  Furthermore, since the substrate 1 and the substrate 2 are hard substrates, they can be easily fixed in the interchangeable lens 200, and the fixed posture can be maintained without being affected by environmental changes. Accordingly, the direction in which the gyro sensor 10X and the gyro sensor 10Y mounted on the gyro sensor 10X and the gyro sensor 10Y are fixed can be easily and accurately set in an accurate mounting state, and the mounting state can be stabilized, and accurate shake detection is always performed. Can be done.

(Modification)
The present invention is not limited to the embodiments described above, and various modifications and changes are possible, and these are also within the equivalent scope of the present invention.
(1) Although the present embodiment has been described by taking an example of an interchangeable lens camera, the present invention is not limited thereto, and for example, a lens may be a fixed camera. It can also be applied to video cameras and field scopes.

(2) In the present embodiment, an example in which the circuit for performing the signal processing of the gyro sensor 10Y is provided on the substrate 1 is not limited to this. For example, a part of the circuit for performing the signal processing of the gyro sensor 10Y is provided. Alternatively, the entire substrate 2 may be provided.

(3) In the present embodiment, the example in which the substrate 1 and the substrate 2 are arranged orthogonally around the optical axis is shown, but the present invention is not limited to this, and has other angles as appropriate according to the convenience of the layout. They may be arranged, and the arrangement position is not limited to around the optical axis.

It is a schematic diagram which shows the outline | summary of the camera equipped with the interchangeable lens of a present Example. It is the figure which expanded and showed the board | substrate 1, the board | substrate 2, and the board | substrate 3. FIG. 3 is a block diagram showing the contents of circuits provided on a substrate 1, a substrate 2 and a substrate 3. FIG.

Explanation of symbols

1, 2, 3: substrate, 10X, 10Y: gyro sensor, 20: lens CPU, 50: AF circuit, 70: communication circuit, 90: power supply circuit

Claims (7)

A first shake sensor for detecting a shake in a first direction;
A second shake sensor for detecting a shake in a second direction different from the first direction;
With
The first vibration sensor is disposed on a first hard substrate, the second vibration sensor is disposed on a second hard substrate different from the first hard substrate, and the first hard substrate and the first hard substrate A lens barrel, wherein a processing circuit for processing at least one of the signals of the first shake sensor and the second shake sensor is disposed on at least one of the second hard substrate. The lens barrel according to claim 1,
A processing circuit for processing signals of both the first shake sensor and the second shake sensor is disposed on at least one of the first hard board and the second hard board,
A lens barrel characterized by In the lens barrel according to claim 1 or 2,
The first hard substrate and the second hard substrate are disposed so that the substrate surfaces are orthogonal to each other,
A lens barrel characterized by In the lens barrel according to claim 3,
The first hard substrate and the second hard substrate are disposed around an optical axis of a lens included in the lens barrel;
A lens barrel characterized by In the lens barrel according to claim 3 or 4,
In at least one of the first shake sensor and the second shake sensor, the direction of the detection axis for detecting shake is orthogonal to the substrate surface to which the shake is attached,
A lens barrel characterized by   An interchangeable lens comprising the lens barrel according to any one of claims 1 to 5. A camera comprising the lens barrel according to any one of claims 1 to 5.

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